LX1660CD

The LX1660 and LX1661 Are Monolithic Switching Regulator ControllerICs designed to provide low-cost, high performance adjustable power supply for microprocessors and other applications requiring a fast transient response and a high degree of accuracy.
They provide an adjustable synchronous Pulse Width Modulator output suitable for a power supply for Pentium® or other microprocessors.Synchronous Rectifier Driver For CPU Core.
The devices can drive dual MOSFETs resulting in typical efficiencies of 85 - 90%, even with loads in excess of 10A. Synchronous shutdown results in increased efficiency in light load applications.Short-Circuit Current Limiting Without Expensive Current Sense Resistors.
The current sensing mechanism can use a PCB trace resistance or the parasitic resistance of the main inductor. For applications requiring a high degree of accuracy, a conventional sense resistor can be used.Hiccup Mode Fault Protection.
The hiccup mode is programmable and with pulse-by-pulse current limiting will help protect the power supply system and load in the even of a short circuit.Ultra-Fast Transient Response Reduces System Cost.
The fixed frequency modulated off-time architecture results in the fastest transient response for a given inductor. Adaptive voltage positioning (LX1661 only) requires fewer low-ESR capacitors to meet stringent transient over and under-shoot specifications.KEY
FEATURES
• Designed To Drive A Synchronous Rectifier Stage — Can Also Be Used In Non Synchronous Applications
• Soft-Start Capability
• Hiccup-Mode Fault Protection
• No Current-Sense Resistor Required For Current Limiting
• Modulated Constant Off-Time Control Mechanism For Fast Transient Response And Simple System Design
• 2V, 0.5% Internal Voltage Reference Brought OutAPPLICATIONS
• Pentium Processor Supplies
• AMD-K6TM Supplies
• Cyrix® 6x86TM Supplies
• Voltage Regulator Modules
• General Purpose DC:DC Supplies